GUEST’s or TRESCA’s THEORY
MAXIMUM SHEAR STRESS THEORY (GUEST’s or TRESCA’s THEORY) According to this theory, the elastic failure occurs when the greatest shear stress reaches a value equal to the shear stress at elastic limit in a simple tension test. This theory is considered for ductile materials, since shearing doesn’t occur in brittle materials. (½)(σ 1 – σ 3 ) = (½)σ e or σ 1 – σ 3 = σ e ...